Modeling Collective Light Emission by a few Solid-State Quantum Emitters

We present recent results on collective emission (superradiance and subradiance) by quantum emitters. The first part is about the effect of making the rotating-wave approximation. This is a very common approximation and already Dicke made it in his seminal work on superradiance [1]. While single-emitter spontaneous emission rates are the same whether the approximation is made, this does not hold for collective emission rates: for two identical emitters, the sub- and superradiance decay rate are still the same whether ones makes the approximation or not, but for two slightly detuned emitters or for three or more identical emitters, the collective rates that one finds will generally be different, and the difference can be considerable [2], as illustrated for the case of two detuned emitters in the Figure.